Android sphygmomanometers which also use Auscultatory technique are less accurate and need repeated calibration

Newer devices which use are “hybrid sphygmomanometers” in this mercury column is replaced by electronic pressure gauge. similar to oscillometric device. Blood pressure is recorded with help of stethoscope like android or mercury sphygmomanometers

Ultrasound transmitter and receiver is placed over brachial artery under blood pressure cuff. Doppler shift due to movement of blood beginning with systole up to diastole is recorded.

In infants this technique is used to record systolic blood pressure canada goose official online retailers 2015 .

Ankle brachial index uses this technique. where in systolic pressure of brachial and posterior tibial artery is compared.

Developed by Penaz. work by principle of “unloaded arterial wall. ”

Arterial pressure is detected by photo-plethysmograph under pressure cuff. Out put of plethysmograph creates a servo loop. which rapidly changes cuff pressure such that artery is maintained in open state canada goose heli arctic xs on sale . Oscillatory pressure in cuff are measured. Cuff can be kept for 2 hours.

Auscultatory Gap

This is defined as loss and reappearance of Korotkoff sounds that occur between systole and diastolic blood pressures during cuff deflation in the absence cardiac arrhythmia.